paper.install(window);


var baum = {
    length: 30,
    angle: Math.PI / 2,
    crown: {
        shape: "kite",
        length: 130,
        width: 0.3,
        bisect: 0.3,
    },
    forks: [
        {
            pos: 0.3,
            branch: {
                angle: 0.3,
                length: 30,
                crown: {
                    shape: "kite",
                    length: 50,
                    width: 0.3,
                    bisect: 0.3,
                },
                forks: [
                    {
                        pos: 0.6,
                        branch: {
                            angle: Math.PI/2.5,
                            length: 40,
                            crown: {
                                shape: "kite",
                                length: 70,
                                width: 0.3,
                                bisect: 0.3,
                            },
                        },
                    }
                ],
            },
        },
        {
            pos: 0.5,
            branch: {
                angle: 3*Math.PI /4,
                length: 30,
                crown: {
                    shape: "kite",
                    length: 50,
                    width: 0.3,
                    bisect: 0.3,
                },
            },
        }
    ],
};


function gen_tree(pos) {
    var baum = new Branch();

    baum.length = (20 + Math.random() * 20);

    var shape;
    if(Math.random() < 0.5) {
        shape = "kite";
    } else {
        shape = "triangle";
    }

    baum.crown = {shape: shape};
    if(shape == "kite") {
        baum.crown.length = (70 + Math.random() * 30);
        baum.crown.width = 0.4 + Math.random() * 0.2;
        baum.crown.bisect = 0.3 + Math.random() * 0.1;
    } else if(shape == "triangle") {
        baum.crown.length = (70 + Math.random() * 30);
        baum.crown.width = 0.4 + Math.random() * 0.2;
        //baum.crown.bisect = 0.3 + Math.random() * 0.1;
    }

    baum.angle = Math.PI / 2; // + Math.random() * 0.2 - 0.1;

    if((shape == "kite") && (Math.random() < 0.5)) {
        var b = {
            length: baum.length * 0.4,
            angle: Math.PI / 5 + Math.random() * 0.45,
            crown: {
                shape: "kite",
                length: baum.crown.length * 0.4,
                width: baum.crown.width,
                bisect: baum.crown.bisect,
                //bisect: 0.5,
            }
        };
        baum.forks = [{
            pos: 0.2 + Math.random() * 0.4,
            branch: new Branch(b),
        }];

        baum.draw(pos);
        var rectified = false;
        var i=0;
        while(baum.collides_crown(baum.forks[0].branch)) {
            baum.forks[0].branch.angle -= 0.01;
            baum.draw(pos);
            rectified = true;
            i += 1;
            if(i>50) {
                var c = new Path.Circle({center:pos, radius: 2, strokeWidt: 1, strokeColor: '#ff0000'});
                //break;
            }
        }

        if(rectified) {
            baum.forks[0].branch.angle -= Math.random() * 0.1;
                var c = new Path.Circle({center:pos, radius: 2, strokeWidt: 1, strokeColor: '#ff0000'});
            baum.draw(pos);
        }
    }

    baum.draw(pos);
    return baum;
}


class Branch {
    constructor(data, parentBranch=null) {
        //this.parentBranch = parentBranch;
        Object.assign(this, data);
        console.log(this);
        if(typeof this.forks !== "undefined") {
            for (let fork of this.forks) {
                fork.branch = new Branch(fork.branch, this);
            }
        }
    }

    draw(pos) {
        if(typeof this._crown !== "undefined") {
            this._crown.removeSegments();
            delete this._crown;
        }
        if(typeof this._branch !== "undefined") {
            this._branch.removeSegments();
            delete this._branch;
        }

        this._branch = new Path();
        var bvec = new Point(Math.cos(this.angle) * this.length,
                                  -1 * Math.sin(this.angle) * this.length);
        var end = pos.add(bvec);
        this._branch.strokeColor = 'black';
        this._branch.strokeWidth = 2;
        this._branch.add(pos);
        this._branch.add(end);

        if(typeof this.crown !== "undefined") {
            console.log("CROWN");
            if(this.crown.shape == "kite") {
                console.log("KITE");
                var cvec = bvec.multiply(1/bvec.length * this.crown.length);
                var bswidth = this.crown.length * this.crown.width;
                var bsvec = new Point(Math.sin(this.angle) * bswidth / 2,
                                      Math.cos(this.angle) * bswidth / 2);
                this._crown = new Path();
                this._crown.strokeColor = 'black';
                this._crown.fillColor = 'white';
                this._crown.strokeWidth = 2;
                this._crown.closed = true;
                //this._crown.selected = true;
                this._crown.add(end);
                this._crown.add(end.add(cvec.multiply(this.crown.bisect))
                                      .add(bsvec));
                this._crown.add(end.add(cvec));
                this._crown.add(end.add(cvec.multiply(this.crown.bisect))
                                      .subtract(bsvec));
                console.log(this._crown);
                
            } else if(this.crown.shape = "triangle") {
                console.log("TRIANGLE");
                var cvec = bvec.multiply(1/bvec.length * this.crown.length);
                var bswidth = this.crown.length * this.crown.width;
                var bsvec = new Point(Math.sin(this.angle) * bswidth / 2,
                                      Math.cos(this.angle) * bswidth / 2);
                this._crown = new Path();
                this._crown.strokeColor = 'black';
                this._crown.fillColor = 'white';
                this._crown.strokeWidth = 2;
                this._crown.closed = true;
                //this._crown.selected = true;
                this._crown.add(end.add(bsvec));
                this._crown.add(end.add(cvec));
                this._crown.add(end.subtract(bsvec));
                console.log(this._crown);
            }
        }

        if(typeof this.forks !== "undefined") {
            for (let fork of this.forks) {
                fork.branch.draw(pos.add(bvec.multiply(fork.pos)));
            }
        }

    }
    collides_crown(other) {
        return this._crown.intersects(other._crown);
    }
}


window.onload = function() {
    var canvas = document.getElementById('canvas');
    paper.setup(canvas);

    //var br = new Branch(baum);

    for(var x=0; x<10; x++) {
        for(var y=0; y<5; y++) {
            var br = new Branch(gen_tree(new Point(50 + x*80, 150 + y*160)));
        }
    }

}